cmos filter

fuzz circuit comparison.

Danger

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Guitarists love there distorion pedals. Here some simple distortion circuits are shown and analysed what they do to the audio signal.

about

A state variable filter is constructed with two integrator amplifier and a summer. The integrators are low bass filters. The output of both is mixed back to the input. This will give three resonses. A High pass, band pass and low pass response.

Figure 1: State variable filter topology

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Figure 2: Simulation of a state variable filter with opamps.

integrator

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cmos svf

1591.5494309189535

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Figure 3: Overdrive 250 Analysis.

state variable biquad filter

1591.5494309189535
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Figure 3: State Variable biquad filter.

References